Limit AuthServiceProxyWrapper.__getattr__ wrapping

Change AuthServiceProxyWrapper.__getattr__ to only wrap proxied attributes, not
real attributes. This way AuthServiceProxyWrapper can continue logging RPC
calls without complicating other object usages, and special case handling for
the .url property can be dropped.

test/functional/test_framework/coverage.py

@@ -31,10 +31,11 @@ class AuthServiceProxyWrapper(object):
         self.auth_service_proxy_instance = auth_service_proxy_instance
         self.coverage_logfile = coverage_logfile
 
-    def __getattr__(self, *args, **kwargs):
-        return_val = self.auth_service_proxy_instance.__getattr__(
-            *args, **kwargs)
-
+    def __getattr__(self, name):
+        return_val = getattr(self.auth_service_proxy_instance, name)
+        if not isinstance(return_val, type(self.auth_service_proxy_instance)):
+            # If proxy getattr returned an unwrapped value, do the same here.
+            return return_val
         return AuthServiceProxyWrapper(return_val, self.coverage_logfile)
 
     def __call__(self, *args, **kwargs):
@@ -52,10 +53,6 @@ class AuthServiceProxyWrapper(object):
 
         return return_val
 
-    @property
-    def url(self):
-        return self.auth_service_proxy_instance.url
-
     def __truediv__(self, relative_uri):
         return AuthServiceProxyWrapper(self.auth_service_proxy_instance / relative_uri)